A new type of joint spreader for open reduction of mandibular condylar fracture

Abstract

The present invention discloses a novel joint spreader for open reduction of mandibular condylar fractures, comprising a left handle (1) and a right handle (2), wherein the left handle (1) and the right handle (2) both comprise a working section and a gripping section, and the joint portion of the working section and the gripping section of the left handle (1) is hingedly connected to the joint portion of the working section and the gripping section of the right handle (2); a spring plate (3) is arranged on the opposite side of the gripping section of the left handle (1) or the right handle (2); a vertical section (12) perpendicular to the working section is arranged at the distal end of the joint portion of the working section of the left handle (1) and the right handle (2), and the vertical section (12) is perpendicular to the plane formed by the two oppositely arranged working sections; the difficulty of exposing the surgical area in condylar fractures is solved, the field of view and space for subsequent anatomical reduction and fixation of fracture fragments is improved, and the difficulty of surgery is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of medical devices, in particular to a novel joint spreader for open reduction of mandibular condyle fracture. Background Art

[0002] Mandibular condylar fractures are relatively common fractures, accounting for 29% to 52% of all mandibular fractures (reference [1]). At present, most scholars at home and abroad agree that open reduction of condylar fractures can give patients a better prognosis, better functional recovery of the temporomandibular joint, and fewer complications (reference [2]). Open reduction refers to surgical open reduction and fixation. There is currently no unified standard for the surgical indications for open reduction of fractures, and there is still controversy. However, it is generally agreed that condylar fractures with limited mouth opening, obvious displacement and dislocation, and severe angulation (≥90°) should be treated surgically in a timely manner.

[0003] The surgical approaches for the surgical treatment of condylar fractures mainly include preauricular incision, postmandibular incision, submandibular incision and endoscope-assisted intraoral incision. The surgical methods mainly include titanium plate fixation after reduction, titanium nail or wire fixation of sagittal fractures, removal of small fracture fragments and reduction of articular disc, etc. Although scholars have made a lot of explorations and efforts to improve the surgical treatment effect of condylar fractures, condylar fractures are still a more complex and risky type of surgery in maxillofacial fracture surgery. The main difficulties are in three aspects: difficulty in exposing the fracture surgical area, difficulty in anatomical reduction of fracture fragments and difficulty in reliable fixation.

[0004] Currently, there is still no effective auxiliary equipment and method for exposing the surgical area during condylar fracture surgery. Traditional methods and some existing auxiliary surgical instruments are difficult to achieve stable and reliable fixation while avoiding secondary damage to the condylar head, articular disc, and surrounding soft tissues (references [3-6]).

[0005] Reference[1].Marwan,H.and Y.Sawatari,What Is the Most Stable FixationTechnique for Mandibular Condyle Fracture? Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons, 2019.77(12): p.2522.e1-2522.e12.

[0006] Refer to [2]. Madadian MA, Simon S, Messiha A. Changing trends in the management of condylar fractures. Br J Oral Maxillofac Surg. 2020 Aug 3: S0266 - 4356(20)30378 - 8.

[0007] Refer to [3]. Sabesan, T. and W. J. Peters, Modified plastic spatula: a condylar retractor. The British journal of oral & maxillofacial surgery, 2006. 44(5): p. 412 - 3.

[0008] Refer to [4]. Kheradpir, A. R., A. T. Chien and R. S. R. Julian, Transoral osteosynthesis of subcondylar fractures of the mandible using a fenestrated Levassier - Merrill retractor. Journal of oral and maxillofacial surgery: official journal of the American Association of Oral and Maxillofacial Surgeons, 2011. 69(7): p. 2006 - 11.

[0009] Refer to [5]. Han, C., et al., New surgical instrument for the treatment of condylar fractures: the digitised condylar retractor. The British journal of oral & maxillofacial surgery, 2020. 58(4): p. 432 - 436.

[0010] Reference [6]. Huang, Summary of the invention

[0011] The purpose of the present invention is to design a new joint spreader for open reduction of mandibular condylar fractures, to solve the problem of difficulty in exposing the surgical area in condylar fractures, to improve the field of vision and space for subsequent anatomical reduction and fixation of fracture fragments, and to reduce the difficulty of surgery.

[0012] The present invention is achieved through the following technical scheme: a new type of joint spreader for open reduction of mandibular condylar fractures includes a left handle and a right handle, the left handle and the right handle both include a working section and a holding section, the joint portion of the working section and the holding section of the left handle is hinged together with the joint portion of the working section and the holding section of the right handle; a spring plate is arranged on the opposite side of the holding section of the left handle or the right handle; a vertical section perpendicular to the working section is arranged at the distal end of the working section of the left handle and the right handle, and the vertical section is perpendicular to the plane formed by the two oppositely arranged working sections; a groove is arranged on the distal working section side of any vertical section, and the notch of the groove is located at the unfolded side of the working section in terms of spatial position, and the size of the notch cooperates with the auxiliary screw.

[0013] As a preferred setting scheme, the spreader consists of two main parts, a left handle and a right handle. Both the left handle and the right handle are provided with a working section and a holding section, wherein the working section is also called the front end, and the holding section is also called the rear end, and there is a joint between the front end and the rear end, and the two joints have a concave-convex matching structure, and the two joints are hinged together through the concave-convex matching structure, and then they are stabilized by other auxiliary parts, so that the left handle and the right handle can be opened and closed with the hinge point as the fulcrum; in order to make the opening or closing of the left handle and the right handle more convenient and smooth, a spring plate is provided on the opposite side of the holding section of the left handle or the right handle; in order to facilitate the insertion operation, a spring plate perpendicular to the working section is provided at the far end of the joint of the working section of the left handle and the right handle. The vertical section is perpendicular to the plane formed by the two oppositely arranged working sections; in order to fully consider the thickness of the soft tissue in the temporomandibular joint area and the surgical depth, the vertical section is extended into the surgical gap without obstructing the surgical field of view, and the length of the vertical section is 20 to 25 mm; in order to reliably open the gap in the surgical area and fix the auxiliary screw for easy installation, a groove is provided on the far working section side of any vertical section, the groove is slightly larger than the auxiliary screw, and the notch of the groove is located on the unfolding side of the working section in terms of spatial position, and the size of the notch is adapted to the auxiliary screw. When used, the auxiliary screw can be placed in the groove, so that it can be firmly fixed in the groove and is not easy to dislocate. The combined gripping end structure can stably and reliably prop up the gap in the surgical area, fully expose the surgical area and expand the operating space.

[0014] In order to further better realize the present invention, the following setting structure is particularly adopted: a limiting plate connecting the two gripping sections is also provided on the left handle and the right handle, and one end of the limiting plate is fixedly connected to one gripping section, and the other end of the limiting plate is movably connected to the other gripping section through a screw.

[0015] As a preferred setting scheme, the spreader is also provided with a limit plate, which can connect the gripping sections of the left handle and the right handle. When setting, one end of the limit plate is fixed to one gripping section, and the other end can be movably connected to the other gripping section through screws according to the width of the spreader as needed.

[0016] In order to further implement the present invention in a better manner, the following configuration structure is particularly adopted: a slide groove having a plurality of limiting holes is provided on the limiting plate.

[0017] As a preferred setting scheme, the limiting plate is provided with a cylindrical protrusion for fixing on a holding section, and correspondingly, the holding section is provided with a hole for interference fit with the cylindrical protrusion, and the limiting plate is provided with a slide groove with multiple limiting holes; a hole is also provided on the other holding section, and the hole is preferably a threaded hole so that a screw can be screwed into it. When the expander is expanded to a suitable width, the screw fixed on the holding section can be inserted into any limiting hole in the slide groove, so that the expander is at a required constant width, so that the user will not encounter an unstable expansion width when using it, thereby affecting the surgical effect.

[0018] In order to further implement the present invention in a better manner, the following configuration structure is particularly adopted: the joint of the left handle and the right handle is hinged together by a pin.

[0019] As a preferred arrangement, after the joint of the left handle and the right handle are hinged together, they can be further fixed by a pin, so that the two can be freely opened and closed with the pin as the rotation axis.

[0020] In order to further implement the present invention in a better manner, the following configuration structure is particularly adopted: the spring plate is fixed to the gripping section of the left handle by means of fixing screws.

[0021] As a preferred arrangement, the spring plate is fixed to the gripping section of the left handle by means of fixing screws, and the movable surface of the spring plate is supported on the right handle.

[0022] In order to better implement the present invention, the following configuration is particularly adopted: grooves for matching the spring plate are provided on opposite sides of the gripping sections of the left handle and the right handle.

[0023] As a preferred setting scheme, grooves are provided on opposite sides of the gripping sections of the left handle and / or the right handle, the fixed surface of the spring plate is fixed in the groove of one gripping section (preferably the left handle), and the movable surface of the spring plate can slide in the groove of the other gripping section (preferably the right handle) according to the size of the spreader.

[0024] In order to further implement the present invention better, the following setting structure is particularly adopted: the working sections of the left handle and the right handle are arc-shaped structures, which can better display the surgical field and facilitate operation.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] The present invention effectively solves the problem of difficulty in exposing the surgical area in condylar fractures, and improves the field of view and space for subsequent anatomical reduction of fracture fragments.

[0027] The working end of the present invention is configured as an arc-shaped structure convex outward, which can better display the surgical field of view and facilitate operation. A vertical section structure is configured at the front end of the working section, and its length fully considers the thickness of the soft tissue in the temporomandibular joint area and the surgical depth, and extends into the surgical gap without obstructing the surgical field of view.

[0028] The limiting holes arranged on the limiting plate of the present invention can fully consider the intraoperative needs, judge the width of the surgical area based on experience, and design a suitable spacing to meet the needs of different patients and different surgical area widths. The limiting holes can be adjusted arbitrarily and fixed by themselves, which can not only ensure the stability of the expansion width, but also free the assistant's hands, which is more labor-saving, quick and time-saving. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the structure of the present invention (top view).

[0030] Figure 2 It is a schematic diagram of the structure of the present invention.

[0031] Figure 3 It is a schematic diagram of the structure of the present invention (there is an auxiliary screw in the groove).

[0032] Figure 4 This is a schematic diagram of the spring plate structure of the present invention.

[0033] Figure 5 This is a schematic diagram of the limiting plate structure of the present invention.

[0034] Among them, 1-left handle, 2-right handle, 3-spring plate, 4-limiting plate, 5-fixing screw, 6-pin, 7-screw, 8-groove, 9-cylindrical protrusion, 10-limiting hole, 11-working surface, 12-vertical section, 13-auxiliary screw. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the orientation or positional relationship indicated by terms, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "set", "lay out", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, or a detachable connection, or integrated, and the specific means are not limited to various conventional mechanical connection methods such as screw connection, interference fit, riveting, and thread-assisted connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0041] It is worth noting that: in this application, when certain known technologies or conventional technical means need to be applied in the field, the applicant may not explain in detail in the text what kind of technical means the known technologies and / or conventional technical means are. However, it cannot be considered that this application does not comply with Article 26, Paragraph 3 of the Patent Law because the technical means are not specifically disclosed in the text.

[0042] Embodiment 1:

[0043] like Figure 1 to Figure 5As shown, a new joint spreader for open reduction of mandibular condylar fractures comprises a left handle 1 and a right handle 2, wherein both the left handle 1 and the right handle 2 comprise a working section and a holding section, and the joint portion of the working section and the holding section of the left handle 1 is hinged together with the joint portion of the working section and the holding section of the right handle 2; a spring plate 3 is arranged on the opposite side of the holding section of the left handle 1 or the right handle 2; a vertical section 12 perpendicular to the working section is arranged at the distal end of the joint portion of the working section of the left handle 1 and the right handle 2, and the vertical section 12 is perpendicular to the plane (working surface 11) formed by the two oppositely arranged working sections; a groove 8 is arranged on the distal working section side of any vertical section 12, and the notch of the groove 8 is spatially located on the unfolded side of the working section, and the size of the notch cooperates with the auxiliary screw 13.

[0044] As a preferred setting scheme, the spreader consists of two main parts: a left handle 1 and a right handle 2. Both the left handle 1 and the right handle 2 are provided with a working section and a holding section, wherein the working section is also called the front end, and the holding section is also called the rear end, and there is a joint between the front end and the rear end, and the two joints have a concave-convex matching structure, and the two joints are hinged together through the concave-convex matching structure, and then they are stabilized by other auxiliary parts, so that the left handle 1 and the right handle 2 can be opened and closed with the hinge point as the fulcrum; in order to make the opening or closing of the left handle 1 and the right handle 2 more convenient and smooth, a spring plate 3 is provided on the opposite side of the holding section of the left handle 1 or the right handle 2; in order to facilitate the insertion operation, a vertical section 12 perpendicular to the working section is provided at the far end of the joint of the working section of the left handle 1 and the right handle 2, and The vertical section 12 is perpendicular to the plane (working surface 11) formed by the two oppositely arranged working sections; in order to fully consider the thickness of the soft tissue in the temporomandibular joint area and the surgical depth, the vertical section 12 extends into the surgical gap without obstructing the surgical field of view, and the length is 20 to 25 mm; in order to facilitate the reliable opening of the surgical area gap and fix the auxiliary screw 13 for easy installation, a groove 8 is provided on the far working section side of any vertical section 12, the groove 8 is slightly larger than the auxiliary screw 13, and the notch of the groove 8 is located on the unfolding side of the working section in terms of spatial position, and the size of the notch is adapted to the auxiliary screw 13. When used, the auxiliary screw 13 can be inserted into the groove 8, so that it can be firmly fixed in the groove 8 and is not easy to dislocate. The combined holding end structure can stably and reliably prop up the surgical area gap, fully expose the surgical area and expand the operating space.

[0045] Embodiment 2:

[0046] This embodiment is further optimized on the basis of the above embodiment, and the same parts as the above technical solution will not be repeated here. Figure 1 to Figure 5As shown, in order to better realize the present invention, the following setting structure is particularly adopted: a limit plate 4 connecting the two gripping sections is also provided on the left handle 1 and the right handle 2, and one end of the limit plate 4 is fixedly connected to one gripping section, and the other end of the limit plate 4 is movably connected to the other gripping section through a screw 7.

[0047] As a preferred setting scheme, the spreader is also provided with a limit plate 4, which can connect the gripping sections of the left handle 1 and the right handle 2. When setting, one end of the limit plate 4 is fixed on one gripping section, and the other end can be movably connected to the other gripping section through a screw 7 according to the width of the spreader as needed.

[0048] In order to further implement the present invention in a better manner, the following configuration structure is particularly adopted: a slide groove having a plurality of limiting holes 10 is provided on the limiting plate 4 .

[0049] As a preferred setting scheme, the limiting plate 4 is provided with a cylindrical protrusion 9 for fixing on a gripping section, and correspondingly, the gripping section is provided with a hole for interference fit with the cylindrical protrusion 9, and the limiting plate 4 is provided with a slide groove with multiple limiting holes 10; a hole is also provided on the other gripping section, and the hole is preferably a threaded hole so that a screw 7 can be screwed into it. When the spreader is spread to a suitable width, the screw 7 fixed on the gripping section can be inserted into any limiting hole in the slide groove, so that the spreader is at a required constant width, so that the user will not encounter an unstable spreading width when using it, thereby affecting the surgical effect.

[0050] Embodiment 3:

[0051] This embodiment is further optimized on the basis of any of the above embodiments, and the same parts as the above technical solutions will not be repeated here. Figure 1 to Figure 5 As shown, in order to better implement the present invention, the following setting structure is particularly adopted: the joint part of the left handle 1 and the right handle 2 is hinged together through a pin 6.

[0052] As a preferred arrangement, after the joint of the left handle 1 and the right handle 2 are hinged together, they can be further fixed by a pin 6 so that the two can be freely opened and closed with the pin 6 as the rotation axis.

[0053] Embodiment 4:

[0054] This embodiment is further optimized on the basis of any of the above embodiments, and the same parts as the above technical solutions will not be repeated here. Figure 1 to Figure 5 As shown, in order to better implement the present invention, the following setting structure is particularly adopted: the spring plate 3 is fixed to the gripping section of the left handle 1 by a fixing screw 5.

[0055] As a preferred arrangement, the spring plate 3 is fixed to the gripping section of the left handle 1 by means of a fixing screw 5, and the movable surface of the spring plate 3 is supported on the right handle 2.

[0056] In order to better implement the present invention, the following configuration is particularly adopted: grooves for matching the spring plate 3 are provided on opposite sides of the gripping sections of the left handle 1 and the right handle 2 .

[0057] As a preferred setting scheme, grooves are provided on opposite sides of the gripping sections of the left handle 1 and / or the right handle 2, the fixed surface of the spring plate 3 is fixed in the groove of one gripping section (preferably the left handle 1), and the movable surface of the spring plate 3 can slide in the groove of the other gripping section (preferably the right handle 2) according to the size of the spreader.

[0058] Embodiment 5:

[0059] This embodiment is further optimized on the basis of any of the above embodiments, and the same parts as the above technical solutions will not be repeated here. Figure 1 to Figure 5 As shown, in order to better realize the present invention, the following setting structure is particularly adopted: the working sections of the left handle 1 and the right handle 2 are arc-shaped structures, which can better display the surgical field and facilitate operation.

[0060] Embodiment 6:

[0061] like Figures 1 to 5 As shown, this embodiment provides a specific structure of a novel joint spreader for open reduction of mandibular condylar fracture, including a left handle 1, a right handle 2, a spring plate 3, a limit plate 4, a fixing screw 5, a pin 6, a screw 7, a groove 8, a cylindrical protrusion 9, and a vertical section 12;

[0062] The front end of the left handle 1 is the working section, and the rear end is the holding section. The working end is an arc convex to the outside, which can better expose the surgical field of view and does not hinder the operation. The front end also includes a vertical section 12 perpendicular to the longitudinal direction, which can be extended into the surgical incision in an L shape. The length of the vertical section 12 is consistent with the depth of the soft tissue of the surgical incision. There is a groove 8 structure facing outward at the top of the working section, and the auxiliary screws 13 at both ends of the joint cavity gap are inserted into the groove 8 for fixing the auxiliary screws 13 as a force point to support the joint gap;

[0063] The inner side of the grip section of the left handle 1 is provided with a screw hole, and the fixing screw 5 is used to fix the spring plate 3;

[0064] The upper surface of the gripping section of the left handle 1 is provided with a concave hole (hole), and the lower surface of the limiting plate 4 is provided with a columnar protrusion 5, and the two are embedded structures (such as Figure 5 ).

[0065] The working section structure of the right handle 2 is symmetrical with that of the left handle 1. A screw hole is provided on the upper surface of the gripping section. The built-in screw 7 is used to limit the limit plate 4. A long groove (groove) is provided on the inner side of the right handle 2 for placing the spring sheet 3.

[0066] The structure of the intersection (joint portion) of the left handle 1 and the right handle 2 is a concave-convex matching structure, which is fixed and connected into a whole by a pin 6, and the connection is firm and the movement is free.

[0067] The main structure of the limit plate 4 is a slide groove type (composed of a plurality of limit holes 10), and the left bottom contains a cylindrical protrusion ( Figure 5 ) is connected to the concave hole of the gripping section of the left handle 1, and a screw 7 can be placed in the slide groove of the limit plate 4 to control the opening width. After the screw 7 is inserted into the slide groove of the limit plate 4, the structure is stable and can be moved freely and flexibly operated;

[0068] The fixed surface of the spring plate 3 is connected to the left handle 1 by means of a fixing screw 5. The right side (movable surface) of the spring plate 3 is close to the inner side of the right handle 2 and can be inserted into the inner side of the right handle 2 and connected with a long groove (groove). The spring plate 3 slides in the long groove, and the connection is firm, not easy to slip, and has high safety.

[0069] When applying:

[0070] 1. An auxiliary screw 13 is implanted at each end of the condylar joint area, namely, the zygomatic arch and the condylar neck;

[0071] 2. Extend the working sections of the left handle 1 and the right handle 2 into the surgical area, and align the auxiliary screws 13 in the grooves 8 at the front ends of the left handle 1 and the right handle 2 respectively;

[0072] 3. According to the size of the fracture displacement, the field of vision and space required for reduction and fixation, the surgeon controls the gripping end limit plate 4 and inserts the screw 7 into the target slide groove (limiting hole 10) to fix it and complete the joint distraction.

[0073] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention is within the protection scope of the present invention.

Claims

1. A new type of joint spreader for open reduction of mandibular condylar fracture, characterized by: The invention comprises a left handle (1) and a right handle (2), wherein the left handle (1) and the right handle (2) both comprise a working section and a gripping section, and the joint of the working section and the gripping section of the left handle (1) is hingedly connected to the joint of the working section and the gripping section of the right handle (2); a vertical section (12) perpendicular to the working section is arranged at the distal end of the joint of the working section of the left handle (1) and the right handle (2), and the vertical section (12) is perpendicular to a plane formed by two oppositely arranged working sections; a groove (8) is arranged on the distal side of the working section of any vertical section (12), and the notch of the groove (8) is located on the unfolded side of the working section in terms of spatial position, and the size of the notch matches the auxiliary screw (13), and the length of the vertical section (12) is 20-25 mm; a spring plate (3) is arranged on the opposite side of the gripping section of the left handle (1) or the right handle (2).

2. The novel joint distractor for open reduction of mandibular condylar fracture according to claim 1, characterized in that: A limiting plate (4) connecting the two gripping sections is also provided on the left handle (1) and the right handle (2), and one end of the limiting plate (4) is fixedly connected to one gripping section, while the other end of the limiting plate (4) is movably connected to the other gripping section via a screw (7).

3. The novel joint distractor for open reduction of mandibular condylar fracture according to claim 2, characterized in that: A slide groove having a plurality of limiting holes (10) is provided on the limiting plate (4).

4. The novel joint distractor for open reduction of mandibular condylar fracture according to any one of claims 1 to 3, characterized in that: The joint portion of the left handle (1) and the right handle (2) is hinged together via a pin (6).

5. The novel joint spreader for open reduction of mandibular condylar fracture according to any one of claims 1 to 3, characterized in that: The spring plate (3) is fixed to the gripping section of the left handle (1) via a fixing screw (5).

6. The novel joint distractor for open reduction of mandibular condylar fracture according to any one of claims 1 to 3, characterized in that: A groove for matching with a spring plate (3) is provided on the opposite side of the gripping section of the left handle (1) and / or the right handle (2).

7. The novel joint distractor for open reduction of mandibular condylar fracture according to any one of claims 1 to 3, characterized in that: The working sections of the left handle (1) and the right handle (2) are arc-shaped structures.

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